DjEditorPositionInfo


1   /*
2    * Copyright (c) 2001-2005 by Genimen BV (www.genimen.com) All rights reserved.
3    * 
4    * Redistribution and use in source and binary forms, with or without
5    * modification, is permitted provided that the following conditions are met: -
6    * Redistributions of source code must retain the above copyright notice, this
7    * list of conditions and the following disclaimer. - Redistributions in binary
8    * form must reproduce the above copyright notice, this list of conditions and
9    * the following disclaimer in the documentation and/or other materials
10   * provided with the distribution. - All advertising materials mentioning
11   * features or use of this software must display the following acknowledgment:
12   * "This product includes Djeneric." - Products derived from this software may
13   * not be called "Djeneric" nor may "Djeneric" appear in their names without
14   * prior written permission of Genimen BV. - Redistributions of any form
15   * whatsoever must retain the following acknowledgment: "This product includes
16   * Djeneric."
17   * 
18   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS"
19   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21   * ARE DISCLAIMED. IN NO EVENT SHALL GENIMEN BV, DJENERIC.ORG, OR CONTRIBUTORS
22   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28   * POSSIBILITY OF SUCH DAMAGE.
29   */
30  package com.genimen.djeneric.ui;
31  
32  import javax.swing.JTextArea  ;
33  import javax.swing.text.JTextComponent  ;
34  
35  /**
36   * @author Wido Riezebos @created 27 mei 2002
37   */
38  public class DjEditorPositionInfo
39  {
40    private String    SKIPCHARS_WOPARAMS = "!*^&{}|<>()-+=[];,/ \t\n\r+-\"'";
41    private String    _skipchars;
42    private String    _skipchars2;
43  
44    JTextComponent    _editor;
45    private String    _word              = "";
46    private String    _prefix            = "";
47    private int     _start             = 0;
48    private int     _end               = 0;
49    private int     _lineStart         = 0;
50    private boolean _supportParameters = false;
51  
52    public DjEditorPositionInfo(JTextComponent   editor, boolean supportParameters)
53    {
54      _supportParameters = supportParameters;
55      initSkipChars();
56      _editor = editor;
57      String   code = editor.getText();
58  
59      _end = editor.getCaretPosition();
60      _start = _end;
61  
62      if (code.length() == 0) return;
63  
64      if (_end > code.length()) _end = code.length();
65      _start = _end;
66  
67      // The char at the position before the cursor determines how to handle; so
68      if (_start > 0) _start--;
69  
70      // If we are not within a word then don't look any further
71      if (_skipchars.indexOf(code.charAt(_start)) != -1)
72      {
73        _start = _end;
74        _word = "";
75        determinePrefix(code);
76        return;
77      }
78  
79      // We are at the end or within a word.
80      // We need to go back to the start of the word
81      while (_start > 0 && _skipchars.indexOf(code.charAt(_start)) == -1)
82        _start--;
83      // We are probably before the word. This is true if we are now at a
84      // skippable
85      // Set the index at the start of the word then
86      if (_skipchars.indexOf(code.charAt(_start)) != -1) _start++;
87  
88      // Some fail-over checks:
89      if (_start == -1) _start = 0;
90      if (_end == -1) _end = _start;
91  
92      if (_end > _start) _word = code.substring(_start, _end).trim();
93      else _word = "";
94  
95      if (_word.length() == 0) _start = _end;
96  
97      // Now move to the end of the word (if we were in the middle of it)
98      // so we will replace the full word later on, not just from start to
99      // cursor.
100     while (_end < code.length() - 1 && _skipchars2.indexOf(code.charAt(_end)) == -1)
101       _end++;
102 
103     determinePrefix(code);
104   }
105 
106   private void initSkipChars()
107   {
108     _skipchars = SKIPCHARS_WOPARAMS;
109     if (!_supportParameters) _skipchars += ":";
110     _skipchars2 = _skipchars + ".";
111   }
112 
113   private void determinePrefix(String   code)
114   {
115     _lineStart = _start;
116     if (_lineStart > 0) _lineStart--;
117     while (_lineStart > 0 && code.charAt(_lineStart) != '\n')
118       _lineStart--;
119     if (code.charAt(_lineStart) == '\n') _lineStart++;
120     if (_lineStart > _start) _lineStart = _start;
121     _prefix = code.substring(_lineStart, _start);
122   }
123 
124   public void replaceRange(String   value, int caretOffset)
125   {
126     if (_editor instanceof JTextArea  )
127     {
128       JTextArea   ta = (JTextArea  ) _editor;
129       ta.replaceRange(value, _start, _end);
130     }
131     else
132     {
133       _editor.setSelectionStart(_start);
134       _editor.setSelectionEnd(_end);
135       _editor.replaceSelection(value);
136     }
137     _editor.setCaretPosition(_start + caretOffset);
138   }
139 
140   public void replaceRange(String   value)
141   {
142     replaceRange(value, value.length());
143   }
144 
145   public int getEnd()
146   {
147     return _end;
148   }
149 
150   public int getStart()
151   {
152     return _start;
153   }
154 
155   public String   getWord()
156   {
157     return _word;
158   }
159 
160   public int getLineStart()
161   {
162     return _lineStart;
163   }
164 
165   public JTextComponent   getEditor()
166   {
167     return _editor;
168   }
169 
170   public void setStart(int start)
171   {
172     _start = start;
173   }
174 
175   public String   getPrefix()
176   {
177     return _prefix;
178   }
179 
180   public String   toString()
181   {
182     StringBuffer   sb = new StringBuffer  (100);
183     if (_word != null)
184     {
185       sb.append(_word);
186       if (_start <= _word.length() && _end <= _word.length())
187       {
188         sb.append("\nSelected: [" + _word.substring(_start, _end) + "] = " + (_end - _start) + " chars");
189       }
190       else sb.append("\nNo selection");
191     }
192     return sb.toString();
193   }
194 }
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